code: def __str__(self) -> str:
      rows = [
          "TreeEnsemble",
          f"root_index={self.root_index}",
          str(self.atts),
      ]
      return "\n".join(rows)
  
file_path: onnx/onnx/reference/ops/aionnxml/op_tree_ensemble_helper.py
imports: import numpy
label_desc: Use image node_id 2 for calling the TreeEnsemble obj's underlying member method code with example usage: obj.__str__() and returns: str